I think for the build quality they're both top notch (short of the hinge issues the GFCs had in the beginning). The GFC camper is ideal from the utility point of view. The side access is invaluable for loading and unloading the truck and I often use it in the "cabana" mode when just hanging out at camp. It's also the most low profile and light weight of the bunch and has the shortest overhang which allows for a small platform roof rack over the cab. The channel system is super useful. I've been able to easily add an awning, WeBoost antenna, roof rack bars, backup camera, etc without having to deal with drilling and adding rivets which you would have to do on the other platforms if you don't option it from the beginning). You've mentioned the main downside.. it's a shorter platform and you have to remove panels to get access to the "downstairs". When going solo I usually have 2 of the panels out and use the long panel as a bed and desk. The other main downside is because of how low profile it is there is absolutely no room to leave your sleeping bags / inflatable pillow / etc on the bed when shutting it. As a matter of fact, it takes some practice folding the tent material perfectly so it shuts easily, otherwise you're wrestling it for it to shut. If I were you I would look into the AluCab Canopy camper. It's pretty burly but has the pros of the GFC (large side access panels, a system to easily add accessories to the outside) and the AT Summit (the flip up bed, and aluminum construction). The downside of that one is of course price and weight, but I think it's a nice balance. For me, the AT Habitat is the only option since I want to build a desk space where I could simultaneously have access to the bed. Short of going to a full size truck and a FourWheelCamper, the AT Habitat is the only camper that provides that kind of square footage.